This study investigated the relationship between psychological stress, academic adjustment and emotional adjustment among Undergraduate Students of Nasarawa State University, Keffi, Nigeria. The study adopted a correlational research design. The population of the study was six thousand, six hundred and thirty five (6,635) male and female undergraduate students of Nasarawa State University, Keffi, Nigeria. The sample of the study was 351 respondents drawn from 300 level students of the university. Data was collected using psychological stress inventory (PSI), academic adjustment inventory (AAI), and emotional adjustment inventory (EAI). The collected data were analysed using frequencies, mean, standard deviation, Pearson product moment correlation and t-test. All tests were done at 0.05 level of significance. The findings of the study revealed, among others, that positive relationships exist between psychological stress and academic adjustment (r=0.889, p=.000); and between psychological stress and emotional adjustment (r=.506, p=001). It is recommended that the management of Nasarawa State University, Keffi should establish functional psychological testing and counselling centres in all the faculties for re-addressing students with psychological stress problem in order to foster positive adjustment.